ALLOYS. 273 



Bronze is copper, containing ten per cent, of tin. 

 Bell metal is a kind of bronze, containing tin in larger 

 proportion. 



Pewter is an alloy of tin with variable proportions 

 of antimony or lead. Britannia ware, so called, is a 

 sort of pewter. 



Type metal is an alloy of lead, containing twenty- 

 five per cent, of copper. By the use of tin, instead of 

 lead, a better, but more expensive type metal may be 

 produced. Zinc, with a few per cent, of copper, lead, 

 and tin, has also been recently employed. 



Fine and coarse solders are alloys of tin and lead 

 the former being two-thirds, and the latter one-fourth, 

 tin. Hard solder is a variety of brass. 



Newton's fusible metal, which has the remarkable 

 property of melting in boiling water, is composed of 

 8 parts of bismuth, 5 of lead, and 3 of tin. 



Many of the above alloys are slightly varied in 

 their character by the addition of other metals in small 

 quantity. 



